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(11)

EP 1 938 510 A1

(12)

(43) Date of publication: 02.07.2008 Bulletin 2008/27 (21) Application number: 06799160.4 (22) Date of filing: 11.10.2006

(51) International Patent Classification (IPC):  H04L 12/28(2006.01) (86) International application number: PCT/KR2006/004080 (87) International publication number: WO 2007/046596 (26.04.2007 Gazette 2007/17)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 21.10.2005 US 728749 P 09.06.2006 KR 20060052065 (71) Applicants: Samsung Electronics Co., Ltd. Yeongtong-gu Suwon-city, Gyeonggi-do 442-742 (KR) The Trustees of Columbia University in the City of New York New York, NY 10027 (US)

(72) Inventors: LEE, Sung-Hyuck Yongin-si, Gyeonggi-do 446-712 (KR) BANG, Jong-Ho Yongin-si, Gyeonggi-do 446-712 (KR) QI SHEN, Charles, The Trustees of Columbia Uuniversity 35 West 116th Street, New York, NY 10027 (US) SCHULZRINNE, Henning, The Trustees of Columbia University 535 West 116th Street, New York, NY 10027 (US) (74) Representative: Lawrence, John  Barker Brettell LLP 138 Hagley Road Edgbaston Birmingham B16 9PW Edgbaston Birmingham B16 9PW (GB)